The best replacement for power inverter is generator.

The best alternatives to power inverter are rated as following:
★★★★★  generator
★  power converter
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Speaking about power inverter, one probably shouldn't forget about solar panel.

Other search terms related to power inverter and their ratings are:
★★★★★ solar panel
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Google Trends

Scale is based on the average worldwide traffic of power inverter in all years. Click on graph for more.
power inverter
generator
power converter